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Search Results: 1 - 10 of 479010 matches for " Mark A. Gregory "
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A Review of Artificial Immune System Based Security Frameworks for MANET  [PDF]
Lincy Elizebeth Jim, Mark A. Gregory
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2016, DOI: 10.4236/ijcns.2016.91001
Abstract: Mobile ad hoc networks (MANETs) are collections of wireless mobile devices that form a communication network with restricted broadcast range, limited resources and without fixed infrastructure. Routing is a critical function in multi-hop MANETs. At the same time, security in MANETs—especially routing security—presents a number of new and interesting challenges. Communication is achieved by relaying data along routes that are dynamically discovered and maintained through collaboration between the nodes. Advances in the field of artificial immune systems provide an opportunity to improve MANET security and performance. Artificial immune systems mimic the functionality of the human immune system wherein there is clear distinction between self and non self and this delineation is important in a MANET where there is no centralized management. The high level of protection provided to the human body by an evolved immune system can be applied as a security feature in MANET. The current security techniques proposed for MANET have varying degrees of success due to the dynamic nature of a MANET. This paper will review different strategies for the application of artificial immune systems to MANETs.
Techniques and Challenges of Data Centric Storage Scheme in Wireless Sensor Network
Khandakar Ahmed,Mark A. Gregory
Journal of Sensor and Actuator Networks , 2012, DOI: 10.3390/jsan1010059
Abstract: Storing, collecting and querying data across miniaturized battery powered Wireless Sensor Networks (WSN) is a key research focus today. Distributed Data-Centric Storage (DCS), an alternate to External Storage (ES) and Local Storage (LS), is thought to be a promising and efficient storage and search mechanism. There has been a growing interest in understanding and optimizing WSN DCS schemes in recent years, where the range query mechanism, similarity search, load balancing, multi-dimensional data search, as well as limited and constrained resources have driven this line of research. In this paper, an extensive state-of-the-art study is provided including the prime WSN DCS schemes, challenges that inspired these schemes, as well as drawbacks and shortcomings of existing solutions. In contrast to previous surveys that briefly discuss the contribution of a few WSN DCS mechanisms, we provide a thematic taxonomy in which schemes are classified according to the problems dealt with including range query, similarity search, data aggregation, sensor network field non-uniformity, multi-replication, load balancing and routing algorithm.
TRManager – Technical Risk Manager
Mark A. Gregory,Christopher White
Journal of Systemics, Cybernetics and Informatics , 2009,
Abstract: This paper presents research into the development of a new information management technique called Technical Risk Manager. Project management involves the use of processes and information management techniques to aid decision making in the pursuit of project success. Project success may be achieved by meeting time, cost or performance criteria. Current project management practices focus on achieving time and cost project success criteria by using three information management techniques developed in the 1950s: Gantt, PERT and Critical Path Method. Technical Risk Manager has been developed to provide an information management technique that may be used to aid project management decision making in the pursuit of achieving the performance project success criteria.
Di-μ-bromido-bis[benzyl(diethyl ether)magnesium]
Mark A. Nesbit,Danielle L. Gray,Gregory S. Girolami
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812025445
Abstract: The title benzyl Grignard reagent, [Mg2Br2(C7H7)2(C4H10O)2], was obtained by reaction of benzyl bromide with magnesium in diethyl ether, followed by crystallization from toluene. The asymmetric unit comprises one half-molecule, the structural dimeric unit being generated by inversion symmetry with an Mg...Mg distance of 3.469 (2) . The Mg(II) atom exhibits a distorted tetrahedral coordination geometry. The crystal packing is defined by van der Waals interactions only.
Recovering Isotropic Statistics in Turbulence Simulations: The Kolmogorov 4/5th-Law
Mark A. Taylor,Susan Kurien,Gregory L. Eyink
Physics , 2003, DOI: 10.1103/PhysRevE.68.026310
Abstract: One of the main benchmarks in direct numerical simulations of three-dimensional turbulence is the Kolmogorov 1941 prediction for third-order structure functions with homogeneous and isotropic statistics in the infinite-Reynolds number limit. Previous DNS techniques to obtain isotropic statistics have relied on time-averaging structure functions in a few directions over many eddy turnover times, using forcing schemes carefully constructed to generate isotropic data. Motivated by recent theoretical work which removes isotropy requirements by spherically averaging structure functions over all directions, we will present results which supplement long-time averaging by angle-averaging over up to 73 directions from a single flow snapshot. The directions are among those natural to a square computational grid, and are weighted to approximate the spherical average. The averaging process is cheap, and for the Kolmogorov 1941 4/5ths law, reasonable results can be obtained from a single snapshot of data. This procedure may be used to investigate the isotropic statistics of any quantity of interest.
On Soliton-type Solutions of Equations Associated with N-component Systems
Mark S. Alber,Gregory G. Luther,Charles A. Miller
Physics , 2000, DOI: 10.1063/1.533133
Abstract: The algebraic geometric approach to $N$-component systems of nonlinear integrable PDE's is used to obtain and analyze explicit solutions of the coupled KdV and Dym equations. Detailed analysis of soliton fission, kink to anti-kink transitions and multi-peaked soliton solutions is carried out. Transformations are used to connect these solutions to several other equations that model physical phenomena in fluid dynamics and nonlinear optics.
The effects of EPA + DHA and aspirin on inflammatory cytokines and angiogenesis factors  [PDF]
Robert C. Block, Usawadee Dier, Pedro Calderon Artero, Gregory C. Shearer, Lisa Kakinami, Mark K. Larson, William S. Harris, Steve Georas, Shaker A. Mousa
World Journal of Cardiovascular Diseases (WJCD) , 2012, DOI: 10.4236/wjcd.2012.21003
Abstract: Objective: In a recent study, we showed that the combination of aspirin plus the ω3 fatty acids eicosapen-taenoic acid (EPA) and docosahexaenoic acid (DHA) synergistically inhibited platelet function. As aspirin, EPA, and DHA have demonstrated anti-inflammatory properties, we hypothesized that the ingestion of EPA and DHA, with and without aspirin, would reduce plasma levels of inflammatory cytokines and angiogenesis factors more than aspirin alone and before aspirin was ingested. Methods: Using multiplex technology, we investigated the effects of aspirin (single-dose 650 mg on day 1), EPA + DHA (3.4 g/d for days 2 - 29), and aspirin with EPA + DHA (day 30) on plasma levels of inflammatory cytokines and angiogenesis factors in healthy adults. Results: Aspirin alone had no effect on any factor versus baseline, but EPA + DHA, with and without aspirin, significantly reduced concentrations of 8 of 9 factors. Although EPA + DHA plus aspirin reduced concentrations of a subset of the factors compared to baseline, neither aspirin alone nor the combination significantly reduced the level of any analyte more robustly than EPA + DHA alone. Conclusions: These data suggest that EPA + DHA has more pronounced down-regulatory effects on inflammation and angiogenesis than aspirin. The implications of these findings for the use of combined therapy for cardiovascular disease remain to be clarified.
The 5-Choice Continuous Performance Test: Evidence for a Translational Test of Vigilance for Mice
Jared W. Young,Gregory A. Light,Hugh M. Marston,Richard Sharp,Mark A. Geyer
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0004227
Abstract: Attentional dysfunction is related to functional disability in patients with neuropsychiatric disorders such as schizophrenia, bipolar disorder, and Alzheimer's disease. Indeed, sustained attention/vigilance is among the leading targets for new medications designed to improve cognition in schizophrenia. Although vigilance is assessed frequently using the continuous performance test (CPT) in humans, few tests specifically assess vigilance in rodents.
An evolutionary frame of work to study physiological adaptation to high altitudes
REZENDE,ENRICO L.; GOMES,FERNANDO R.; GHALAMBOR,CAMERON K.; RUSSELL,GREGORY A.; CHAPPELLl,MARK A.;
Revista chilena de historia natural , 2005, DOI: 10.4067/S0716-078X2005000200016
Abstract: how complex physiological systems evolve is one of the major questions in evolutionary physiology. for example, how traits interact at the physiological and genetic level, what are the roles of development and plasticity in darwinian evolution, and eventually how physiological traits will evolve, remains poorly understood. in this article we summarize the current frame of work evolutionary physiologists are employing to study the evolution of physiological adaptations, as well as the role of developmental and reversible phenotypic plasticity in this context. we also highlight representative examples of how the integration of evolutionary and developmental physiology, concomitantly with the mechanistic understanding of physiological systems, can provide a deeper insight on how endothermic vertebrates could cope with reduced ambient temperatures and oxygen availability characteristic of high altitude environments. in this context, high altitude offers a unique system to study the evolution of physiological traits, and we believe much can be gained by integrating theoretical and empirical knowledge from evolutionary biology, such as life-history theory or the comparative method, with the mechanistic understanding of physiological processes
Implementing an apparent-horizon finder in three dimensions
Thomas W. Baumgarte,Gregory B. Cook,Mark A. Scheel,Stuart L. Shapiro,Saul A. Teukolsky
Physics , 1996, DOI: 10.1103/PhysRevD.54.4849
Abstract: Locating apparent horizons is not only important for a complete understanding of numerically generated spacetimes, but it may also be a crucial component of the technique for evolving black-hole spacetimes accurately. A scheme proposed by Libson et al., based on expanding the location of the apparent horizon in terms of symmetric trace-free tensors, seems very promising for use with three-dimensional numerical data sets. In this paper, we generalize this scheme and perform a number of code tests to fully calibrate its behavior in black-hole spacetimes similar to those we expect to encounter in solving the binary black-hole coalescence problem. An important aspect of the generalization is that we can compute the symmetric trace-free tensor expansion to any order. This enables us to determine how far we must carry the expansion to achieve results of a desired accuracy. To accomplish this generalization, we describe a new and very convenient set of recurrence relations which apply to symmetric trace-free tensors.
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